Observation window for furnaces



Oct. 26 1926.

M. CURRY ET. AL

10N wINDow Fon FuRNA'oEs OBSERVAT' Filed May 14 INVENTOR Malcolm Curry l rmmz :Starr Ba 92;, ATToRNEY CIJ Cil

Patented Oct. 26, 1926.

tl EFD STATES MALCOLM CRRY, F SCARSDALE,

Application led May 14,

f ed during inspection of the fuel bed.

Another important object of the invention is to provide a woven wire heat-absorbing sheet located between the glare-eliminating panel and the opening into the furnace, and so arranging said heat-absorbing sheet as to subject it to cooling air currents eX- terior of the furnace.

Another object of the invention is to provide a glare-eliminatin@ panel formed of a gelatin sheet confined between woven wire gauze sheets, the gelatin sheet being preferably blue in color and the wire gauze serving as means to hold the sheet flat and also as a heat-absorbing and diffusing means.

Another object of the invention is to provide means for removably and resiliently holding the woven wire heat-absorbing sheet in position in the frame of the observation window. y

To the foregoing and other ends, which will hereinafter appear, the invention consists in the features of construction, arrangements of parts, and combinations of devices set forth in the following description .and particularly pointed out in the appended claims.

ln the drawings:

Fig. 1 is a front elevation of the window;

Fig. 2 a vertical sectional view taken on the line 2-2 of Fig. 1 showing the sliding frame in its normal lowered position;

Fig. 3 a horizontal sectional view taken on the line 3 3 of Fig. 2 showing the sliding frame raised and the window open for observation;

Fig. 4 a detail perspective view of the woven wire heat-absorbing sheet;

Fig. 5 a detail perspective view of the glare-eliminating panel;

Fig. 6 a detail sectional view showing a PATENT NEW YORK, AND S'JMLIIRLR, I-I. BARN'U'M, 0F HAMDEN,

CONNECTICUT.

OBSERVATION WINDOW FOR FURNACES.

1925. Serial No, 109,093.

glasslplate in position as a glare-eliminating pane 5 Fig. 7 a detail perspective view of a modi'- lied form of means for resiliently holding the heat-absorbing sheet in position in the frame of the window; and

Fig. 8 a detail perspective View of a portion of a modified form of a glare-eliminating panel.

The furnace wall 10, which may be of any suitable construction, is @provided with a peep-opening l1 at a` point suitable for observing the fuel bed. This opening may be of any suitable shape in cross section, but preferably the side walls fiare inwardly and the lower wall inclines inwardly and downwardly to enable the observer to view the fuel bed. Vhile we prefer to provide the peep-opening in the,briclr wall of the furnace, as shown, itpwill be obvious that the opening may be formed in any suitable part of the furnace, and that the window hereinafter described may be attached to furnace walls, casings, or doors of various construction provided with peep-openings.

The metallic window frame or casing 12 is constructed substantially as shown in our Patent No. 1,417,976, dated May 30, 1922. It is of genera-l rectangular box-like form, is preferably cast in one piece, as shown, said frame being formed with a bolt fiange 13 around its open inner end and being held against the outer side of the furnace wall over the peep-opening by bolts. The top, bottom and side edges of the frame are preferably offset from the corresponding edges of the peep-opening, as shown, so that the brick wall will be interposed between the edges of the frame and the combustion chamber of the furnace to afford protection to the frame.

The outer end wall of the frame 12 is provided with a rectangular view opening 16 registering with the peep-opening 11, and is formed with integral upturned lugs 17 along the lower edge of opening 16 and integral inwardly turned lugs 18 along the vertical edges of openings 16, said lugs 17 and 18 forming retaining means for a plate 19 of blue or other suitably colored glare-eliminating transparent material. This plate may be a sheet of blue gelatin or other non-fran gible material held firmly between two sheets of fine wire gauze Q0. The gauze sheets are pressed rmly together and serve to hold the gelatin sheet dat and to form a plate sufficiently rigid to permit it to be readily plaeed in position on the lugs 1'? Vofthe trame. rl`he Wire gauze-enclosing means is preferably termed of a single sheet of `gauze overlapped around one edge ot' the gelatin sheet as shown in Fig. 5. r'lhis is a convenient and cheap means ot' forming the glareeliminiting panel. rllhe gauze sheets serve as hea t-absorbing an l. .diffusing means. lllhen the panel is in position on the vtrame the Wire gauze is in intimate` Contact with the metal ot' the trame and the heat absorbed by the gauze will be readily transmitted to the metal trame. lt will, ol` course, be understood that instead ot' using the gelatin and gauze panel, a sheet or `blue glass 19a may be substituted therefor, as shown in Fig. 6.

A supplemental metal trame, preferably cast in one piece, is slidable through the main trame or easing 12. The slidable trame comprises side bars 21 loosely lit-ting in gnideivays or channels 22 formed in the imperforate side Walls ot the iframe 12, a topeross-bar 23, a botto1i'ierossbar 24, and an intermediate Cross-bar 25. Said sliding frame is normally held by gravity in the position shown in Figs. 1 and 2, in Which yposition its downward movement is arrested by the engagement ot a flange 26, -formed around the upper edge ot' the cross-bar 23,

with the top Wall of the trame 12. The top Wall of the outer trame or casing 12 is termed with a rectangular slot 27, through which the supplemental trame 'is slidable, and the bottom Wall is formed With a flange 28 on which the intermediate cross-bar seats when the parts are in the position shown in Figs. 1 and 2. The bottom Wall of the easing 12 is provided with a slot 29 to permit movement ot the side bars 21 and bottom cross-bar 24 therethrough. rlhe top crossbar 23 is provided with a longitudinal slot 30 through which one or more panels or plates 31 oi" opaque non-combustible mate-rial ivhich is also a non-conductor of heat, such as asbestos boards, are inserted in the upper section of the sliding traine, said asbestos plates 31 resting on bar 25 and being held in the frame by suitable means. One of the side bars 21 of kthe sliding frame is provided with a vertical slot 33, extending between cross-bars 24 and 25, through which a sheet or plate 34 of transparent non-combustible or heat-resisting material. such as miea, is slidably inserted in the loiver vhalt ot the frame. The mica sheet 34 is retained in the sliding trame by pairs of lugs 35 formed on bars 21, 24 and 25. A. suitable handle 37 is secured to the lower eross-bar 24 of the sliding frame. y

It will be observed that when the parts are V in the position shown in Figs. 1 fand 2, bars 25 and`23 close slots 29 and 27 so that there neoaeii can be no substantial influx of air, While the asbestos Aboards 31 prevent inward or outward passage of air through the sliding trame and shield the glare-eliminating panel 19 jtrom heat radiating through the peepopening 11 and also from flame, hot gases .and soot. lvlhen the sliding frame is raised by pushing up en handle 37, the asbestos boards are moved out or register with the peepbpening and the sheet or miea is moved between the peep-opening and the blue panel to shield the panel and permit observation of the fuel bed. lllhen the iarts ai'e in raised position it will be observed that the mica sheet and cross-bars 24 `and 25 Will prevent said guideivays 'being formed on the upper and lower Walls Vof the 'trame and the guide grooves being formed along the inner suraee thereof. These guideways are formed substantially midway between the sliding trame and the vie-W opening 16 in the iront Wall oit the casing 12. In the upper and lower Walls of the easing 12, on opposite sides of the guideivays 38 are to 1ined openings 39 so that air may pass upwardly through. the easing 12 along both sides ot the grooved Ways and along the inner side of the glare-eliminating panel 19. One vertical wall ot' the casing 12 is formed with a vertical slot 40 which. opens into the grooves or' the guideways 38. Fitting the guideivays, 5

and removable through the slot 40, is a Woven wire heat-absorbing-and-diverting sheet 41. This heat-absorbing sheet is prei"- erably formed et a comparatively line mesh of Woven Wire, but it must be of a suiliciently i" large mesh to permit the :tire or fuel bed to be viewed through it. The' heat-absorbing sheet is resiliently pressed against the Walls Vof the grooved guideivays by spring flanges 42 formed integral with the longitudinally extending binding flanges 43. These binding flanges are clamped along the upper and lower longitudinal edges of the gauze sheet, as shown clearly in Fig. 4. The spring vflanges 42 Lpress the binding flanges into intimate contact with the metal ot the frame. The spring flanges 42 also bear on the Walls of the grooved guideways and furnish additional metallic contact between the heatabsorbing Wire gauze and the metal of the easing 12. The vertical `flange of the easing 12, opposite the slot 40 isv formed With inwardly extending flanges 44 to receive between them the inner vertical edge ot the sheet 41. That endV of the sheet 41 Which lil) 50 and clamping` them thereto.

inserted therein. The finger piece 45 is preferably formed integral with a metallic binding strip 46 which is clamped along the edge of the sheet 41.

If desired the spring flanges 42 may be omitted and the sheet 41 resiliently held in place by means of spring strips 47 or similar resilient means which may be inserted in the grooved guideways 38 and serve as means for pressing the upper and lower edges of the heat-absorbing sheet 41 into intimate contact with the metal ofthe casing 12.

l/Vhen the sliding frame is raised the mica sheet 34 is interposed between the peepopening 11 and the heat-absorbing wire gauze sheet 41. The heat passing through the mica will be largely absorbed by the wire gauze and transmitted to the casing 12. There will be a rapid circulation of outside air up through the openings 39 on opposite sides of the gauze sheet, said circulation serving to cool the wire gauze and the casing 12. The gelatin sheet isprotected by its enclosing sheets of wire gauze. These wire gauze sheets will also serve to absorb heat and transmit it to the casing 12. These wire gauze sheets of the glare-eliminating panel will also be cooled by the upward currents of air flowing through the casing and outside of it. The wire gauze enclosing sheets and the blue gelatin sheet form a non-breakable glare-eliminating panel. rPhe gelatin is sufciently protected from the furnace heat by the woven wire sheets and by the outside air currents to prevent it from melting` The l0 gelatin sheet may freely expand and contract but it is not frangible andwill not break. lt will remain unchanged vand will resist a high degree of heat.

g In this form the blue gelatin sheet 19 is provided with a sheet of gauze 2Oa which is secured` to one side thereof by bending the ends of the sheet over the edges of the gelatin sheet The gauze sheet 2Oa may be secured in any suitable manner to the gelatine sheet.

What we claim is:

l. The combination with a furnace having a peep-opening, of a panel of transing; an opaque closurey panel located inwardly of the heat-absorbing panel andV V,adapted to be shifted into and out ofa position to close the peep-opening; and `a closure panel of transparent heat-resistingmaterial adapted to be shifted into a. posit-ion to regl ister with the peep-opening inwardly of the heat-absorbing panel when the opaque panel is moved out of its closing position.

2. An observation window for furnaces comprising a casing open at its inner end and formed with an observation opening at its outer end in alignment with the open inner end; a panel of transparent glareeliminating material extending across said observation opening; a shiftable heat-resisting closuremember for the inner end of the casing; a light admitting heat-absorbing sheet mounted within the casing between the closure member and the glare-eliminating panel and adapted to protect said panel from the furnace heat.

' 3. An observation window for furnaces comprising a casing formed with open inner and outer ends in alinement with each other;

a panel of transparent glare-eliminating ma'- and outer ends in alinement with each other;

a panel of transparent glare-eliminating material closing the outer end of the casing; a shiftable closure for the inner end of the casing; a sheet of woven wire mounted within the casing between the closure and the panel and spaced from both, said sheet being adapted to protect the panel from the furnace heat7 and the casing being formed with openings in the top and bottom thereof to admit transverse air currents from the outside lacross `the said sheet.

ln Fig. 8 a slight modified form of the 15 glare-eliminating panel is shown.

5. An observation window for furnaces comprising a casing formed with open inner and outer ends in alinement with each other;

a panel oftransparent glare-eliminating material closing the outer end of the casing; a

closure-member slidably connected to the easing to move across the inner end thereof and provided with an opaque heat resisting area; a panel of transparent heat resisting material carried by the closure member, said transparent panel and opaque area being adapted to alternately close the inner end of the casing when the closure member is shifted in opposite directions, and a sheet of woven wire located between the glareeliminating panel and the closure member and adapted `to protect the glare-eliminating panel from the furnace heat, the casing being formed with openings permitting free circulation of outside air across said'woven sheetf `6; Thecombination of Aa furnace-having itl@ VGt)

a peep-opening, `ot a casing attached at its inner end to the furnace at said opening, a panel of transparent glare-eliminating material extending transversely of the casing inthe line of vision through the peep-opening, a shield slidable transversely of the casing between said paneland opening andfclosing communication therebetween, said shield having a panel ot heat non-conducting material and a panel of transparent yheatresist ing material shittable alternately between the peep-opening and the glare-eliminating panel, and a Woven Wire heat-absorbing' sheet located Within the casing lbet-Ween lthe shield and the glareeliminating panel,the said casing having openings vin its top and bottom Walls on one side ot' the .heat-absorbing sheet.

i. AThe combination ot a furnace having a peep-opening, ot a casing attached at its inner end to the furnace at said opening, a panel ot transparent glare-eliminating marterial extending transversely ot thecasing in Athe line o t vision through the peep-opening,

and comprising a sheet of non-frangible `transparent glare-eliminating material and sheets oiLx Wire gauze clamped on lopposite sides thereof, a shield slidable transversely ot the casing-between vsaid panel vand opening` and closing communication therebetween at all times, said shield having a panel ot heat nonconducting material and a panel Vot transparent heat-resisting` material shittpeep-opening, ot a casing` attached at its inner end to the furnace at said opening, a panel ot transparent glare-'eliminating material extending transversely ott the casing inthe line of vision through the peepfopening, and comprising asheet ot nonetrangible flexible transparent glare-eliminating ma.- terial and sheets ot Wire gauze clamped on Vopposite sides thereof, a shittable shield carried by the casing and adapted to be moved into and out ot position between ,the .peepopening` and the glare-eliminating panel.

9. The combination oit a furnace having a peep-opening, ot a casing` attached at its inner end to the furnace around said opening, a panel of transparent glare-eliminat ing1 material extending transversely of the casing in the line ot vision through-the peep opening, and comprising a sheet -Of non-A trangible transparent glare-eliminatingmaterial and a sheet of Wirev gauze clamped thereto and `covering substantially the entire area of the glare-eliminating material.

10. An observation `Window for, furnaces,

reveals comprising a casi-ng formed With anobservation opening at its .outer end, its inner end being 1open and in alinement With the observation opening; a panel of transparent glare-,eliminatingmaterial mounted to close said observation opening; a shitta-ble closure member for the inner end of the casing; a Woven wire heat-absorbing sheet located xvithinthe casing` between `the :said closure member andthe glare-,eliminating .pa-nel and l adapted `to protect said panel from the turnace `rheat; and resilient means pressing` the edges rof the .heat-absorbing sheet into close contact with the metal of the casing.

1,1. An observation Window for furnaces, comprising- .a A casing` formed .with lran observation opening at its outer end, its inner end .being open and in lalinement With the observation open-ing; a panel ot transparent ,glareehminating material mounted to kclose .said .observation opening; a shiftable closure member fortheinnerend of the casing;

la .removable Woven Wire heat-absorbing .sheet located lWithin the .casing between ythe Asaid closure `member and the glare-eliminatlsheet of Wire. gauze clamped thereto'and covering substantially the entire area of the ,glarevehminating material, and a Woven wire heat-absorbing sheet located between lsaid panel and the peep-opening'.

V18. inobservation Window for furnaces, comprising a lcasing;` formed Withopen inner and outerends in alinei'nent With each other, a panelof transparent glare-eliminating material Vclosingtherouter end of said casing, a shiiftably mounted opaque closure member oi heat-resisting material adapted to be` Ashifted to .cover and `uncover the inner end ot the casing, asheet ot transparent heat-resisting material closingsaid inner end When theV opaque closure member is shifted to its uncovering position, and `an intermediate light-admitting heat-diverting' sheet mounted Within thecasing between the said transparent sheet and the v glare-eliminating panel yand spaced from both, the casing being formed with openings adapted to admit an `outside aircurrent across one tace ot said intermediate sheet.

la. An .Observatlon WlndOW for Afurnaces,

comprising@icasneltormed Withepen inner ,andouterbfends inahnement With each other,V

a panel of transparent glare-eliminating material closing the outer end of said casing, a shiftably mounted opaque closure member of heat-resisting` material adapted to be shifted to cover and uncover the inner end of the casing', a sheet of transparent heatresisting' material closing said inner end When the opaque closure member is shifted to its uncovering position, and an intermediate light-admitting' heat-diverting sheet mounted Within the casing between the said transparent sheet and the glare-eliminating panel and spaced from both, the casing beinar formed with openings adapted to admit outside air currents across both faces of said intermediate sheet.

15. An observation Window for furnaces, comprising a casing formed with open inner and outer ends in alinement with each other; a panel of transparent glare-eliminating material closing the outer end of the casing; a

closure member slidably/ connected to the casing; to move across the inner end thereof andprovided With an opaque heat-resisting` area; a panel of transparent heat-resisting` material carried by the closure member, said transparent panel and opaque area being` adapted to alternately close the inner end of the casing When the closure member is shifted in opposite directions; and a metallic heat-absorbing-and-conducting sheet adapted to admit light, located between the glare-eliminating panel and the said closure1 said sheet being adapted to protect said. panel from the furnace heat and the casing; being` formed to admit an outside air current to the heatfab'sorbing sheet. v

In testimony whereof We hereunto affix our signatures.

MALCOLM CURRY. STARR H. BARNUM. 

